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以常规整枝株型为对照,对多茎倒伞株型光合系统质量及根系发育状况进行研究。结果表明:多茎株型有效叶面积增大,叶面积系数最大值为4.55,为常规株型的1.23倍;吐絮期主茎叶片叶绿素含量提高11.8%;盛花期(7月26日),棉田光强分布行间、株间,光强分别提高22.4%和19.1%;棉株倒四叶CO2同化量:初花期为常数株型的1.45倍,终花期(7月19日)为常数株型的1.31倍;地上部干物质生产量为15723kg/hm2为常规株型1.17倍,生殖器官干物重152.1g,为常规株型的1.28倍。多茎株型根干重及根系活力:初花期为常规株型的1.1倍和1.32倍,吐絮期为常规株型的1.39倍和1.77倍;多茎株型根系中可溶性醣含量盛花期为常规株型的1.15倍,结铃期为常规株型的1.30倍。多茎株型建造高质量光合系统,地上与地下相互促进协调发育,既发挥了叶枝对产量的补偿功能,又利用叶枝与主茎水肥的竞争关系减少赘芽滋生,实现高产简化目标。
The normal pruning plant type was used as a control to study the quality and root development of the photosynthetic system of multi-stem inverted umbrella plant. The results showed that the effective leaf area of multiple stems increased, the maximum leaf area coefficient was 4.55, which was 1.23 times of that of the conventional plant type. Chlorophyll content increased by 11.8% The light intensity of cotton plants increased by 22.4% and 19.1%, respectively. The CO2 assimilation of four leaves in cotton plants was 1.45 times of the initial plantlets at the first flowering stage, and the constant flowering plant (July 19) 1.31 times of that of the control. The aboveground biomass production was 15723kg / hm2, which was 1.17 times that of the conventional plant type and 152.1g of the dry weight of the reproductive organs, 1.28 times that of the conventional plant type. The root dry weight and root vigor of multi-stalked plants were 1.1 times and 1.32 times that of the conventional plantlets at the first flowering stage and 1.39 times and 1.77 times that of the conventional plantlets at the boll opening stage. The full-flowering stage of soluble sugar content 1.15 times that of plant type, and the boll period was 1.30 times of the conventional plant type. Multi-stem plant type construction of high-quality photosynthetic systems, ground and underground mutual promotion of coordinated development, not only to play a compensatory function of the leaf twigs yield, but also the use of watermelon branches and the main competition to reduce the growth of vegetative buds to achieve the goal of high yield and simplify.